MC9328MX21 Product Preview, Rev. 1.1
10
Freescale Semiconductor
Signal Descriptions
NF_WE
NAND Flash Write Enable output signal. This signal is multiplexed with and PC_BVD2 of PCMCIA.
NF_RB
NAND Flash Ready Busy input signal. This signal is multiplexed with PC_RST of PCMCIA.
NF_IO[15:0]
NAND Flash Data input and output signals. NF_IO[15:7] signals are multiplexed with A[25:21] and
A[15:13]. NF_IO[7:0] signals are multiplexed with several PCMCIA signals.
PCMCIA Controller
PC_A[25:0]
PCMCIA Address signals. These signals are multiplexed with A[25:0].
PC_D[15:0]
PCMCIA Data input and output signals. These signals are multiplexed with D[15:0].
PC_CD1
PCMCIA Card Detect1 input signal. This signal is multiplexed with NFIO[7] signal of NF.
PC_CD2
PCMCIA Card Detect2 input signal. This signal is multiplexed with NFIO[6] signal of NF.
PC_WAIT
PCMCIA Wait input signal to extend current access This signal is multiplexed with NFIO[5] signal
of NF.
PC_READY
PCMCIA Ready input signal to indicate card is ready for access. This signal is multiplexed with
NFIO[4] signal of NF.
PC_RST
PCMCIA Reset output signal. This signal is multiplexed with NFRB signal of NF.
PC_OE
PCMCIA Memory Read Enable output signal asserted during common or attribute memory read
cycles. This signal is multiplexed with NFALE signal of NF.
PC_WE
PCMCIA Memory Write Enable output signal asserted during common or attribute memory cycles.
This signal is shared with RW of the EIM.
PC_VS1
PCMCIA Voltage Sense1 input signal. This signal is multiplexed with NFIO[2] signal of NF
PC_VS2
PCMCIA Voltage Sense2 input signal. This signal is multiplexed with NFIO[1] signal of NF
PC_BVD1
PCMCIA Battery Voltage Detect1 input signal. This signal is multiplexed with NFIO[0] signal of NF
PC_BVD2
PCMCIA Battery Voltage Detect2 input signal. This signal is multiplexed with NF_WE signal of NF
PC_SPKOUT
PCMCIA Speaker Out output signal. This signal is multiplexed with PWMO signal.
PC_REG
PCMCIA Register Select output signal. This signal is shared with EB2 of EIM.
PC_CE1
PCMCIA Card Enable1 output signal. This signal is multiplexed with NFCE signal of NF.
PC_CE2
PCMCIA Card Enable2 output signal. This signal is multiplexed with NFWP signal of NF.
PC_IORD
PCMCIA IO Read output signal. This signal is shared with EB3 of EIM.
PC_IOWR
PCMCIA IO Write output signal. This signal is shared with OE signal of EIM.
PC_WP
PCMCIA Write Protect input signal. This signal is multiplexed with NFIO[3] signal of NF.
PC_POE
PCMCIA Output Enable signal to enable voltage translation buffers and transceivers. This signal is
multiplexed with NFCLE signal of NF.
PC_RW
PCMCIA Read Write output signal to control external transceiver direction. Asserted high for read
access and negated low for write access. This signal is multiplexed with NFRE signal of NF.
PC_PWRON
PCMCIA input signal to indicate that the card power has been applied and stabilized.
Table 2. i.MX21 Signal Descriptions (Continued)
Signal Name
Function/Notes